Classification of Elements and Periodicity in Properties
Class 11 · Chemistry · 48 Questions
What would be the IUPAC name and symbol for the element with atomic number 120?
How would you justify the presence of 18 elements in the 5th period of the Periodic Table?
The elements Z=117 and 120 have not yet been discovered. In which family/group would you place these elements and also give the electronic configuration in each case.
Considering the atomic number and position in the periodic table, arrange the following elements in the increasing order of metallic character: Si, Be, Mg, Na, P.
Which of the following species will have the largest and the smallest size? Mg, Mg²⁺, Al, Al³⁺.
The first ionization enthalpy (ΔᵢH) values of the third period elements, Na, Mg and Si are respectively 496, 737 and 786 kJ mol⁻¹. Predict whether the first ΔᵢH value for Al will be more close to 575 or 760 kJ mol⁻¹? Justify your answer.
Which of the following will have the most negative electron gain enthalpy and which the least negative? P, S, Cl, F. Explain your answer.
Using the Periodic Table, predict the formulas of compounds which might be formed by the following pairs of elements; (a) silicon and bromine (b) aluminium and sulphur.
Show by a chemical reaction with water that Na₂O is a basic oxide and Cl₂O₇ is an acidic oxide.
What is the basic theme of organisation in the periodic table?
Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?
What is the basic difference in approach between the Mendeleev’s Periodic Law and the Modern Periodic Law?
On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.
In terms of period and group where would you locate the element with Z=114?
Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
Which element do you think would have been named by (i) Lawrence Berkeley Laboratory (ii) Seaborg’s group?
Why do elements in the same group have similar physical and chemical properties?
What does atomic radius and ionic radius really mean to you?
How do atomic radius vary in a period and in a group? How do you explain the variation?
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions. (i) F⁻ (ii) Ar (iii) Mg²⁺ (iv) Rb⁺